Central Heating Installation Cost
£3,500–£7,000
typical UK range
Updated
A full central heating installation in the UK costs £3,500–£7,000 for an average 3-bed property. This includes a new gas boiler, radiators throughout the house, all pipework, controls, and commissioning. Larger homes, complex layouts, or systems with underfloor heating cost more.
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How much does each option cost?
| Type / scope | Typical cost | Notes |
|---|---|---|
| Central heating for 2-bed flat or house8–10 radiators, combi boiler, thermostatic radiator valves, programmer. Full installation typically 3–5 days | £3,000–£5,000 | 8–10 radiators, combi boiler, thermostatic radiator valves, programmer. Full installation typically 3–5 days |
| Central heating for 3-bed house10–14 radiators, combi or system boiler. The most common specification in the UK. 4–6 days | £4,000–£6,500 | 10–14 radiators, combi or system boiler. The most common specification in the UK. 4–6 days |
| Central heating for 4-bed house14–18 radiators, possibly system boiler with cylinder for higher demand. 5–8 days depending on complexity | £5,500–£8,500 | 14–18 radiators, possibly system boiler with cylinder for higher demand. 5–8 days depending on complexity |
| Radiators (per room, beyond standard count)Individual radiator supply and installation including pipework branch, thermostatic radiator valve, and lock shield valve | £150–£400 | Individual radiator supply and installation including pipework branch, thermostatic radiator valve, and lock shield valve |
| Underfloor heating additionPer room. Wet underfloor heating requires its own manifold and zone controls, adding significant cost to a central heating installation | £500–£2,000 | Per room. Wet underfloor heating requires its own manifold and zone controls, adding significant cost to a central heating installation |
| Smart controls and programmerMulti-zone programmer, smart thermostat (Nest, Hive, or manufacturer-branded), and wireless thermostatic radiator valves | £150–£400 | Multi-zone programmer, smart thermostat (Nest, Hive, or manufacturer-branded), and wireless thermostatic radiator valves |
What affects the price?
- Property size and number of radiators — the dominant cost driver. Each additional radiator adds approximately £150–£400 in parts and labour
- Type of boiler — a combi boiler (no cylinder) is more cost-effective for smaller properties; a system boiler with unvented cylinder costs more but suits larger or multi-bathroom homes
- Existing pipework — properties being converted from electric heating or older systems starting from scratch cost more than those upgrading existing central heating
- Pipework routes — straightforward ground-floor extensions are cheaper than complicated routes through joists, walls, or around structural elements
- Location in the property — ground floor installations are simpler than running pipework to upper floors or loft extensions
- Number of bathroom zones — properties with multiple bathrooms that want independent zone control require more complex controls and pipework
- Finishing — if the installation requires boxing in of pipework or replastering after installation, this is usually a separate cost (builder/plasterer)
- Location — London and South East labour rates are 20–40% higher than the national average
What's included in the price?
- Gas boiler supply and installation
- All radiators and thermostatic radiator valves (TRVs)
- All copper pipework (flow and return)
- Magnetic system filter
- Room thermostat and programmer
- Pump, motorised zone valves, and expansion vessel where required
- Pressure testing and system flush before filling
- System inhibitor chemicals
- Commissioning, testing, and balancing all radiators
- Gas Safe notification
- Benchmark commissioning certificate
How long does it take?
A full central heating installation in a 3-bed property typically takes 4–6 working days for a team of 2 engineers. The timeline includes: first-fix pipework (running pipes through joists and walls), second-fix (fitting radiators, boiler, and controls), and commissioning (flushing, filling, testing, and balancing). A 2-bed flat might be completed in 3–4 days; a large 4-bed house could take a week. During the installation, there will be no heating or hot water, and the engineers may need access to most rooms including loft space.
Do I need one?
A full central heating installation is typically needed when a property has no existing central heating system (e.g. converting from electric storage heaters or night storage), or when the existing system is so old and deteriorated that a full replacement is more cost-effective than piecemeal repair. Properties being renovated, new extensions requiring additional radiators, or homes being upgraded for sale or rental often justify a full installation. For rental properties, adequate heating is a legal requirement under the Housing Act.
How do you avoid overpaying?
- Get at least 3 detailed quotes from Gas Safe registered engineers or heating contractors. Prices vary significantly for the same specification
- Specify exactly what you want before requesting quotes — the number of radiators, boiler type, and control requirements. This ensures you're comparing like-for-like
- Consider the timing — spring and summer are quieter periods for heating engineers and you may negotiate better pricing or faster scheduling
- Bundle the installation with an annual service agreement — many contractors offer a slight discount on installation for customers who commit to annual servicing
- Choose standard radiator sizes where possible — non-standard radiators for period properties or unusual spaces cost more
- Accept standard pipe routing where aesthetically acceptable — concealing pipework behind walls or in floor voids adds cost (boxing in, replastering) that may not be worth the visual improvement
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Frequently asked questions
We’re happy to answer all your questions.
How much does central heating cost to install in a 3-bed house?
A full central heating installation in a 3-bed house costs approximately £4,000–£6,500 in the UK, depending on the boiler type, number of radiators, and location. London and the South East are typically 20–40% above this range.
How long does central heating installation take?
Typically 4–6 working days for a 3-bed house with a team of 2 engineers. Smaller properties take 3–4 days; larger or more complex installations can take a week or more.
Should I get a combi or system boiler for central heating?
Combis suit smaller homes with one bathroom — no hot water cylinder needed. System boilers with an unvented cylinder suit larger homes with multiple bathrooms, providing higher simultaneous hot water flow rates. For most 3-bed houses, either can work — discuss with your engineer.
Do I need planning permission for central heating?
Not usually for standard domestic central heating. The work is notifiable under Building Regulations (Part J for the boiler, Part L for energy efficiency), but Gas Safe registered engineers self-certify. A new boiler or gas pipe in certain conservation areas may need checking with the local authority.
Can central heating be installed in a flat?
Yes — flats can have independent central heating systems with their own boiler, though pipework routing can be more complex in multi-story buildings. Check building regulations and leasehold documents before installation, as some buildings have restrictions on individual boiler installations.
Sources & References
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